package typeinfo;
import typeinfo.interfacea.*;
class B implements A{
    public void f(){}
    public void g(){}
}
public class InterfaceViolation {
    public static void main(String[] args) {
        A a=new B();
        a.f();
        System.out.println(a.getClass().getName());
        if(a  instanceof B){
            B b =(B)a;
            b.g();
        }
    }
}
